Home / 100,112.28-138,167.52-65,685.96

Finding the Fourth Proportional to 100,112.28, 138,167.52 and 65,685.96

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Solution

The fourth proportional to 100,112.28, 138,167.52 and 65,685.96 is: 90,654.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,112.28 : 138,167.52 = 65,685.96 : x
  2. Step 2: Convert to fraction form
    100,112.28/138,167.52 = 65,685.96/x
  3. Step 3: Cross multiply
    100,112.28x = 138,167.52 × 65,685.96
  4. Step 4: Simplify right side
    100,112.28x = 9,075,666,192.02
  5. Step 5: Solve for x
    x = 9,075,666,192.02/100,112.28
  6. Step 6: Final answer
    x = 90,654.87

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.